EP1742332B1 - Dispositif de déplacement pour l'inversion du sens de rotation - Google Patents

Dispositif de déplacement pour l'inversion du sens de rotation Download PDF

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Publication number
EP1742332B1
EP1742332B1 EP06116052A EP06116052A EP1742332B1 EP 1742332 B1 EP1742332 B1 EP 1742332B1 EP 06116052 A EP06116052 A EP 06116052A EP 06116052 A EP06116052 A EP 06116052A EP 1742332 B1 EP1742332 B1 EP 1742332B1
Authority
EP
European Patent Office
Prior art keywords
contact
stator
carrier
contact means
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06116052A
Other languages
German (de)
English (en)
Other versions
EP1742332A3 (fr
EP1742332A2 (fr
Inventor
Reinhard Riedl
Markus Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1742332A2 publication Critical patent/EP1742332A2/fr
Publication of EP1742332A3 publication Critical patent/EP1742332A3/fr
Application granted granted Critical
Publication of EP1742332B1 publication Critical patent/EP1742332B1/fr
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/18—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having displaceable main or auxiliary brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders

Definitions

  • the invention relates to an electric hand tool with an electric motor, which has a stator with a stator housing, and an adjusting device for reversing the direction of rotation of the motor.
  • This has a stator on the housing by releasable connection means rotatably mounted contact carrier.
  • At this field contact means for electrical connection to a stator winding of the stator and fixed contact means are provided, which are electrically connected to the field contact means.
  • the adjusting device has a relative to the contact carrier rotatable brush carrier, are provided on the two carbon guides and electrically connected with these switching contact means.
  • the switching contact means are in each case electrically connectable in a rotational end position of the adjusting device with the fixed contact means of the contact carrier.
  • Such electric hand tools have a universal motor with a commutator, which is electrically contacted via carbon brushes in the carbon guides.
  • the two carbon guides are rotated together with the brush holder carrying them when switching from right to left and vice versa by means of a handle accessible from the outside in the circumferential direction. With this rotational movement of the brush holder takes place at the same time a polarity reversal of the carbon brushes against the fixed contact means and thus a change in the direction of rotation of the motor.
  • a device for adjusting the carbon brushes which has a contact plate and a brush holder.
  • the contact plate is fixed via a plug connection fixed to the stator of the electric motor. Furthermore protrude from the contact plate from hook elements, which engage behind the brush holder and thus keep it rotatable on the contact plate.
  • a switchable contact system for reversing the Carbon brushes is housed, and on the free side of a paragraph-shaped edge of the brush holder for sealing rests.
  • the brush holder is fixed axially.
  • the motor, the contact plate and the brush holder can be made separately and easily mounted, which reduces the manufacturing cost of the electric hand tool.
  • an electric hand tool has an electric motor with a stator and a stator housing, wherein an adjusting device for reversing the direction of rotation of the motor is provided on the upper side.
  • an electrical hand tool comprises an electric motor with a stator and a stator housing, wherein laterally an adjustment for reversing the direction of rotation of the motor is provided with a rotatably attached to the stator housing via releasable connection means contact carrier, the field contact means for electrical connection to a stator winding of the stator and Feestromestoff which are electrically connected to the Feldumblemittein.
  • On a relative to the contact carrier rotatable brush holder two carbon guides and electrically connected to these switching contact means are provided which can be brought into electrical connection with the fixed contact means of the contact carrier.
  • the stator housing has an axial stop for the brush holder, in which the handles of the brush holder are engaged.
  • the present invention has for its object to avoid the disadvantages mentioned in an electric hand tool and to ensure an exact installation position of the carbon brushes with respect to the commutator with cost-effective production.
  • the object is achieved by an electric hand tool according to claim 1.
  • the stator housing forms an axial stop for the brush holder of the brush holder is located directly on the stator, whereby this determines the mounting position of the brush holder.
  • the stator housing can be formed by a carrier housing of the stator winding or by a motor housing, in which the stator is installed. In this way, the brush holder relative to the stator can be aligned exactly, which in turn a particularly accurate installation position of the carbon brushes is achieved with respect to the commutator. This results in a better commutation and a lower carbon brush wear.
  • the axial stop is formed by a sliding track, against which the carbon guides slidably and which is formed on the stator housing.
  • the carbon guides support themselves on the stator housing, whereby the installation position of the carbon brushes relative to the commutator can be set even more precisely.
  • the grinding path can be formed continuously or in two separate sections.
  • inclined surfaces are provided on the carbon guides, which come into two rotational end positions, in which the two opposite directions of rotation of the engine are connected, with correspondingly inclined contact surfaces in abutment, which are each formed on a protruding from the stator housing rotational stop and thereby facing the stator housing.
  • the carbon guides are pressed against the axial stop.
  • the carbon guides are fixed in the two rotational end positions on the one hand in the circumferential direction and simultaneously biased in the axial direction against the contact carrier.
  • radially oppositely acting spring means are provided between the brush holder and the contact carrier at two circumferentially opposite positions. In this way, the brush holder relative to the contact carrier and the stator housing can be centered very precisely.
  • the spring means are formed by two rounded ends of a leaf spring held on the leaf spring, each projecting through a passage opening of the brush holder and are supported on the contact carrier.
  • the centering of the brush holder is achieved by a low-cost leaf spring, which is also easy to install due to the storage in the brush holder.
  • the fixed contact means are formed by contact tongues arranged in the form of a jaw, between each of which one of the switching contact means can be clamped.
  • the brush holder is axially supported on the side facing away from the stator on a device housing of the electric hand tool.
  • the brush holder can be set in a very simple manner with respect to the second axial direction by a stop, whereby a permanent investment of the coal guides can be achieved on the slideway.
  • This axial stop can be formed for example by housing ribs or paragraphs, to which the brush holder is applied during assembly in the axial direction.
  • Fig. 1 shows an electric hand tool 2, such as a combined drill-screw device with an electric motor 4 for non-illustrated drive a tool holder 6.
  • the motor 4 has a non-rotatably connected to a rotor 8 commutator 10, which is a commutator K in operation rotates.
  • a stator winding 14 which is housed in a partially dashed lines indicated stator housing 16, which in turn is rotatably inserted into a device housing 18 of the electric hand tool 2.
  • the commutator 10 is mounted at its end remote from the rotor 8 on a bearing block 20 which is supported by retaining ribs 24 which extend away from an end face 22 of the stator housing 16.
  • Fig. 2 is mounted on the end face 22 of the bearing housing 16 around the commutator 10 and the retaining ribs 24 during assembly of the electric hand tool 2, a total of 26 designated adjustment.
  • This has an annular contact carrier 28 and a likewise annular brush holder 30.
  • the contact carrier 28 is attached to the stator housing 16 such that field contact means 32 provided on the contact carrier 28, corresponding to the assembly lines M1, are inserted into contact openings 34, which are embedded in the end face 22 of the stator housing 16. In these contact openings 34 are not shown Contact tongues which are connected to the stator winding 14.
  • the contact carrier 28 is screwed non-rotatably by means not shown screws on the front side 22, wherein for receiving the screws screw holes 36 are provided on the contact carrier 28 and on the end face 22.
  • the field contact means 32 are formed by jaw-shaped contact pairs, between which the contact tongues of the stator winding 14, not shown, are clamped.
  • the field contact means 32 are on the contact carrier 28 both with switch wires 38 for contacting a device switch 40 (see Fig.1 ) and electrically connected to mouth-shaped fixed contact means 42a, 42b, which are arranged in the opening of the annular contact carrier 28 and open in the circumferential direction.
  • Interference suppression elements 44 are provided between the fixed contact means 42a, 42b and the field contact means 32.
  • the in 3 and 4 brush holder 30 shown in detail is rotatable by actuation of an accessible from outside the device housing 18 handle 46 along the pivoting direction S in two rotational end positions relative to the stator 12 and the contact carrier 28.
  • the brush holder 30 has two carbon guides 48, in each of which a carbon brush 50 is biased for the purpose of contacting the commutator 10 to the center of the annular brush holder 30 out.
  • each carbon guide 48 on both sides in the pivoting direction S, there is a respective abutment element 54a, 54b, which has an inclined surface 56 (see FIG Fig.1 ) trains.
  • These abutment members 54a, 54b cooperate with each of four rotary stoppers 58a, 58b which, as shown in FIG Fig.1 , can be seen from the end face 22 of the stator housing 16 protrude in the direction of the brush holder 30 in approximately L-shaped.
  • the rotation stops 58a, 58b each form a contact surface 60, which faces the end face 22 of the stator housing 16.
  • the brush holder 30 can be supported on correspondingly formed, not shown supporting elements of the device housing 18.
  • Such support elements could, for example, at an in Fig. 1 illustrated housing cover 68 may be formed, which supports the adjustment device to the rear, thereby providing a permanent concern of the carbon guides 48 in the support portion 62 on the sliding track 66.
  • a leaf spring 70 is held on the brush holder 30 which projects with looped rounded ends 72 two opposing recesses 74 on the brush holder 30 radially outwardly. These are based in the installed state opposite to two concave support surfaces 76, which are formed on the contact carrier 28 (see Fig.2 ). In this way, the brush holder 30 can be additionally centered relative to the contact carrier 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Motor Or Generator Frames (AREA)

Claims (5)

  1. Appareil électrique portatif (2) comprenant un carter d'appareil (18), un moteur électrique (4) qui comporte un stator (12) avec un carter de stator (16), et un dispositif de déplacement (26) pour l'inversion du sens de rotation du moteur (4), comprenant un porte-contacts (28) qui est solidarisé en rotation au carter de stator (16) par l'intermédiaire de moyens de liaison détachables et qui comporte des moyens de contact de champ (32) pour la liaison électrique avec un enroulement de stator (14) du stator (12) et des moyens de contact fixe (42a, 42b) qui sont reliés électriquement aux moyens de contact de champ (32), et comprenant un porte-balais (30) qui est apte à tourner par rapport au porte-contacts (28) et sur lequel sont prévus deux guide-charbon (48) et des moyens de contact de commutation (52a, 52b), lesquels sont reliés électriquement aux guide-charbon (48) et peuvent être amenés en liaison électrique avec les moyens de contact fixe (42a, 42b) du porte-contacts (28), le carter de stator (16) comportant une butée axiale pour le porte-balais (30), caractérisé en ce que la butée axiale est formée par une piste de glissement (66) contre laquelle les guide-ctarbon (48) sont en appui glissant et qui est ménagée sur le carter de stator (16), et en ce que sur les guide-charbon (48) sont prévues des surfaces inclinées (56) qui, dans deux positions de rotation extrêmes, viennent en contact avec des surfaces d'appui d'inclinaison correspondante (60), lesquelles sont chacune ménagées sur une butée de rotation (58a, 58b) faisant saillie sur le carter de stator (L6) et sont ainsi tournées vers le carter de stator (7.6), les guide-charbon (48) étant poussés contre la butée axiale.
  2. Appareil électrique portatif selon la revendication 1, caractérisé en ce que deux moyens élastiques à action radiale contraire sont prévus dans des positions circonférentielles opposées entre le porte-balais (30) et le porte-contacts (28).
  3. Appareil électrique portatif selon la revendication 2, caractérisé en ce que les moyens élastiques sont formés par des extrémités arrondies (72) d'un ressort à lame (70) maintenu sur le porte-balais (30), lesquelles extrémités dépassent chacune à travers une ouverture traversante (74) du porte-balais (30) et prennent appui sur le porte-contacts (28).
  4. Appareil électrique portatif selon une des revendications 1 à 3, caractérisé en ce que les moyens de contact fixe (42a, 42b) sont formés chacun par des contacts qui sont disposés en forme de mâchoires et entre lesquels peut être serré un des moyens de contact de commutation (52a, 52b).
  5. Appareil électrique portatif selon une des revendications 1 à 4, caractérisé en ce que, sur le côté opposé au stator (12), le porte-balais (30) prend appui axialement sur le carter d'appareil (18) de l'appareil électrique portatif (2).
EP06116052A 2005-07-04 2006-06-26 Dispositif de déplacement pour l'inversion du sens de rotation Active EP1742332B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005000084A DE102005000084A1 (de) 2005-07-04 2005-07-04 Verstellvorrichtung zur Drehrichtungsumkehr

Publications (3)

Publication Number Publication Date
EP1742332A2 EP1742332A2 (fr) 2007-01-10
EP1742332A3 EP1742332A3 (fr) 2007-03-28
EP1742332B1 true EP1742332B1 (fr) 2009-08-26

Family

ID=37024974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06116052A Active EP1742332B1 (fr) 2005-07-04 2006-06-26 Dispositif de déplacement pour l'inversion du sens de rotation

Country Status (4)

Country Link
US (1) US7355314B2 (fr)
EP (1) EP1742332B1 (fr)
KR (1) KR101294580B1 (fr)
DE (2) DE102005000084A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026106B4 (de) 2007-06-05 2024-03-21 Robert Bosch Gmbh Elektrohandwerkzeugmaschine mit einer drehbaren Bürstenplatte
JP5180697B2 (ja) * 2008-06-19 2013-04-10 株式会社マキタ 手持式作業工具
CN102388525B (zh) * 2009-01-24 2014-09-24 马夸特有限责任公司 用于电动机的调节装置
KR101055951B1 (ko) * 2010-07-15 2011-08-09 계양전기 주식회사 접속이 안정적인 전류전환장치를 구비하는 전동공구
JP6309881B2 (ja) * 2014-11-14 2018-04-11 株式会社マキタ 作業工具
JP6086550B2 (ja) * 2015-06-26 2017-03-01 国立大学法人東京工業大学 半導体デバイス電極の製造方法
JP7080606B2 (ja) * 2017-08-29 2022-06-06 株式会社マキタ 作業工具
KR102253998B1 (ko) * 2019-11-25 2021-05-21 계양전기 주식회사 회전식 모드 전환장치를 구비한 전동공구의 모터부

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440465A (en) * 1965-10-01 1969-04-22 Millers Falls Co Reversing mechanism for electric motors
DE2327782A1 (de) * 1973-05-30 1974-12-19 Hilti Ag Elektrisches gesteinsbohr- und meisselgeraet
AU570069B2 (en) * 1983-09-09 1988-03-03 Black & Decker Incorporated Electric motors
DE3524614A1 (de) * 1985-07-10 1987-01-15 Bosch Gmbh Robert Handwerkzeugmaschine fuer rechts- und linkslauf
NL8800366A (nl) * 1988-02-15 1989-09-01 Emerson Electric Co Montage-inrichting voor borstels bij een omkeerbare collectormotor.
DE19545651A1 (de) * 1995-12-07 1997-06-12 Marquardt Gmbh Verstellvorrichtung für die Kohlebürsten an einem Elektromotor
DE19605202C1 (de) * 1996-02-13 1997-09-18 Atlas Copco Elektrowerkzeuge Elektrowerkzeugmaschine mit Umschalteinrichtung für Rechts-/Linkslauf
US5955802A (en) 1997-12-19 1999-09-21 Black & Decker Inc. Reversing mechanism for electric motors
US6133665A (en) * 1998-08-14 2000-10-17 S-B Power Tool Company Brush system for electric motors
DE19911355A1 (de) * 1999-03-15 2000-09-21 Hilti Ag Elektromotor
DE19952332A1 (de) * 1999-10-29 2001-05-03 Hilti Ag Bohrgerät
DE10041631A1 (de) * 2000-08-24 2002-03-07 Hilti Ag Universal-Elektromotor für Handwerkzeuggeräte
DE10152963A1 (de) * 2001-10-26 2003-05-15 Bosch Gmbh Robert Elektromaschine
US6998754B2 (en) * 2004-03-05 2006-02-14 Energy Conversion Systems Holdings, Llc Brush assemblies

Also Published As

Publication number Publication date
KR20070004420A (ko) 2007-01-09
DE102005000084A1 (de) 2007-01-18
US20070001536A1 (en) 2007-01-04
DE502006004636D1 (de) 2009-10-08
EP1742332A3 (fr) 2007-03-28
KR101294580B1 (ko) 2013-08-07
EP1742332A2 (fr) 2007-01-10
US7355314B2 (en) 2008-04-08

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